Vascular Surgery Practice Questions

Q: What is the most accurate method for measuring portal hypertension?

Hepatic venography. **Explanation:** The gold standard and most accurate method for measuring portal hypertension is the measurement of the **Hepatic Venous Pressure Gradient (HVPG)** via **Hepatic Venography**. **1. Why Hepatic Venography is Correct:** Portal hypertension is defined as a pathological increase in portal venous pressure. Direct measurement (transhepatic or transvenous) is invasive and risky. Therefore, the indirect measurement of the pressure gradient between the portal vein and the inferior vena cava is used. During hepatic venography, a catheter is wedged into a small hepatic vein to measure the **Wedge Hepatic Venous Pressure (WHVP)**, which reflects sinusoidal pressure. The HVPG is calculated as: * **HVPG = WHVP – Free Hepatic Venous Pressure (FHVP)** * Normal HVPG: 1–5 mmHg. * Clinically significant portal hypertension: **≥10 mmHg** (predicts development of varices). * Risk of variceal bleed: **≥12 mmHg**. **2. Why Other Options are Incorrect:** * **A. Doppler Ultrasound:** This is the **initial/screening investigation** of choice. It can show indirect signs (reversal of flow, dilated portal vein, splenomegaly), but it cannot provide an accurate numerical pressure measurement. * **C & D. CT and MRI:** These are excellent for visualizing anatomy, collateral vessels (portosystemic shunts), and liver morphology, but they are static imaging modalities and cannot measure intravascular pressures. **3. Clinical Pearls for NEET-PG:** * **Gold Standard:** Hepatic Venography (HVPG). * **Best Screening Tool:** Upper GI Endoscopy (to look for esophageal varices). * **First-line Imaging:** Doppler Ultrasound. * **HVPG in Pre-hepatic Portal Hypertension:** In conditions like Portal Vein Thrombosis, the HVPG remains **normal** because the site of resistance is before the sinusoids.

Q: All are true about intermittent claudication except:

Pain is positional. **Explanation:** Intermittent claudication is the hallmark symptom of chronic lower limb ischemia, typically caused by **Peripheral Arterial Disease (PAD)**. It is defined as reproducible muscle pain, cramping, or fatigue that occurs during exercise and is relieved by rest. **Why "Pain is positional" is the correct (false) statement:** Claudication pain is **exertional**, not positional. It is triggered by an imbalance between oxygen supply and demand in the muscles during metabolic activity. In contrast, **positional pain** (pain relieved by hanging the leg over the bed or aggravated by elevation) is a feature of **Critical Limb Ischemia (Rest Pain)** or venous disease, but not stable intermittent claudication. **Analysis of other options:** * **A. Most common in calf muscle:** True. The superficial femoral artery is the most common site of occlusion in PAD, leading to claudication in the calf (the muscle group distal to the obstruction). * **C. Atherosclerosis is an important predisposing factor:** True. Systemic atherosclerosis is the primary etiology. Risk factors include smoking, diabetes mellitus, hypertension, and hyperlipidemia. * **D. Relieved by rest:** True. By definition, claudication pain subsides within 2–5 minutes of standing still (the "stop-walk-stop" cycle), as metabolic demand returns to baseline. **High-Yield Clinical Pearls for NEET-PG:** * **Boyd’s Classification:** Used to grade the severity of intermittent claudication. * **Leriche Syndrome:** Triad of claudication (hip/buttock), impotence, and absent femoral pulses due to aortoiliac occlusion. * **Ankle-Brachial Index (ABI):** The best initial diagnostic test. Claudicants typically have an ABI between **0.5 and 0.9**. * **Management:** The first-line treatment for stable claudication is **supervised exercise therapy** and smoking cessation, not surgery.

Q: What is the most common site for a venous ulcer?

Lower 1/3 of leg and ankle. **Explanation:** The correct answer is **C. Lower 1/3 of leg and ankle**. Venous ulcers (stasis ulcers) primarily occur due to chronic venous insufficiency (CVI) and venous hypertension. The most common site is the **medial aspect of the lower one-third of the leg**, specifically the area just above the medial malleolus. This region is often referred to as the **"Gaiter Zone."** **Why the Lower 1/3 and Ankle?** The underlying pathophysiology involves the failure of the "calf muscle pump" and incompetent perforator veins (Cockett’s perforators). This leads to blood pooling and high ambulatory venous pressure in the distal leg. The resulting extravasation of macromolecules and fibrin cuff formation impairs oxygen diffusion, leading to skin breakdown and ulceration in this specific anatomical area. **Analysis of Incorrect Options:** * **A. Sole of foot:** This is the characteristic site for **neuropathic (trophic) ulcers**, commonly seen in Diabetes Mellitus or Leprosy, due to repeated pressure and loss of sensation. * **B & D. Lower 2/3 and Middle 1/3 of leg:** While venous changes can extend upward, the primary site of maximum venous pressure and the location of the most significant perforators (which trigger the ulceration) is the distal third. **High-Yield Clinical Pearls for NEET-PG:** * **Gaiter Zone:** The area between the mid-calf and the medial malleolus. * **Appearance:** Venous ulcers are typically shallow, irregular in shape, have a granulating base, and are relatively painless compared to arterial ulcers. * **Associated Signs:** Lipodermatosclerosis (inverted champagne bottle leg), hyperpigmentation (hemosiderin deposition), and varicose veins. * **Treatment Gold Standard:** Compression therapy (e.g., Four-layer bandage/Unna boot) is the mainstay of management once arterial insufficiency is ruled out.

Q: Lumbar sympathectomy is indicated for all of the following conditions EXCEPT:

Intermittent claudication. **Explanation:** Lumbar sympathectomy involves the surgical removal of the 2nd, 3rd, and 4th lumbar sympathetic ganglia. This procedure results in permanent vasodilation of the skin vessels and inhibition of sweating in the lower limbs. **Why Intermittent Claudication is the Correct Answer:** Intermittent claudication is pain caused by ischemia of the **skeletal muscles** during exercise. Sympathectomy primarily increases blood flow to the **skin** rather than the muscles. In fact, it may worsen claudication by causing a "steal phenomenon," where blood is diverted from the deep muscular vessels to the superficial cutaneous vessels. Therefore, it is not indicated for claudication. **Analysis of Other Options:** * **Causalgia (Complex Regional Pain Syndrome II):** Sympathectomy interrupts the pain-spasm-pain cycle and reduces sympathetic overactivity, making it a classic indication for chronic neuropathic pain. * **Rest Pain:** In patients with Buerger’s disease (TAO) or peripheral arterial disease who are unfit for bypass, sympathectomy can increase cutaneous collateral circulation, providing relief from rest pain and helping to heal small ischemic ulcers. * **Raynaud’s Disease:** While more common in the upper limbs (cervicodorsal sympathectomy), lumbar sympathectomy is indicated for severe, refractory Raynaud’s affecting the feet to prevent digital gangrene. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Indication:** Distal ischemia (skin changes/ulcers) in Buerger’s Disease (TAO). * **Anatomical Landmark:** The sympathetic chain lies on the bodies of lumbar vertebrae, medial to the Psoas major muscle. * **Key Contraindication:** It is ineffective in patients with extensive gangrene or where the ankle-brachial pressure index (ABPI) is very low (<0.3), as there is no "vasomotor tone" left to relax. * **Side Effect:** Post-sympathectomy neuralgia (pain in the thigh) is a common transient complication.

Q: What is true about mesenteric vein thrombosis?

Heparin is administered.. **Explanation:** Mesenteric Vein Thrombosis (MVT) accounts for approximately 5–15% of all cases of mesenteric ischemia. Unlike arterial occlusion, MVT often has a more insidious onset and is frequently associated with hypercoagulable states. **1. Why Option C is Correct:** The cornerstone of management for MVT is **systemic anticoagulation with Heparin**. Immediate administration of heparin prevents thrombus propagation, allows for the recruitment of collateral vessels, and reduces the risk of bowel infarction. In many cases of non-transmural ischemia, anticoagulation alone can lead to the recanalization of the venous system and clinical recovery. **2. Why Other Options are Incorrect:** * **Option A:** Peritoneal signs (rebound tenderness, guarding) are **not always present**. They only appear late in the disease progression once transmural bowel infarction and gangrene have occurred. Early MVT typically presents with "pain out of proportion to physical findings." * **Option B:** Thrombectomy is **not always performed**. Surgical or radiological thrombectomy is reserved for patients with deteriorating clinical status or those who do not respond to medical management. The primary surgical goal is usually the resection of non-viable bowel rather than venous thrombectomy. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Most common is a hypercoagulable state (Protein C/S deficiency, Factor V Leiden) or portal hypertension. * **Diagnosis:** **Contrast-enhanced CT (CECT)** is the gold standard (shows a "rim sign" or filling defects in the mesenteric veins). * **Management:** If the patient is stable and has no signs of peritonitis, start Heparin immediately. If peritonitis is present, emergency laparotomy and bowel resection are mandatory. * **Prognosis:** MVT has a better prognosis and lower mortality rate compared to Mesenteric Arterial Embolism.

Q: A middle-aged man presents with a scalp swelling noticed since childhood. The neck swelling has a 'bag of worms' appearance and a bruit is heard over it. What is the most likely diagnosis?

Cirsoid aneurysm. **Explanation:** The correct answer is **Cirsoid Aneurysm**. **1. Why Cirsoid Aneurysm is correct:** A cirsoid aneurysm is not a true aneurysm but a **congenital arteriovenous malformation (AVM)** involving the scalp, most commonly the superficial temporal artery and its associated veins. * **Pathophysiology:** Direct communication between high-pressure arteries and low-pressure veins leads to massive dilatation and tortuosity of the vessels. * **Clinical Presentation:** It typically presents as a pulsatile, "bag of worms" swelling on the scalp. The presence of a **bruit** or thrill is a pathognomonic sign of the underlying arteriovenous shunt. While congenital, they often enlarge during puberty or following minor trauma. **2. Why the other options are incorrect:** * **Plexiform Neurofibroma:** While it also has a "bag of worms" feel (classic for Neurofibromatosis Type 1), it is a nerve sheath tumor. It is **non-pulsatile** and lacks a bruit. * **Toxic Nodular Goitre:** This presents as a neck swelling (thyroid) associated with hyperthyroidism. While a bruit can be heard in Graves' disease due to hypervascularity, it does not occur on the scalp or have a "bag of worms" texture. * **Varicocele:** This occurs in the **scrotum** (pampiniform plexus), not the scalp. While it shares the "bag of worms" description, the anatomical location makes it incorrect. **Clinical Pearls for NEET-PG:** * **Classic Triad:** Scalp swelling + "Bag of worms" feel + Pulsations/Bruit = Cirsoid Aneurysm. * **Treatment:** Selective embolization followed by surgical excision is the preferred management. * **Differential Diagnosis:** Always differentiate from a plexiform neurofibroma by checking for pulsations and the "emptying sign" (present in vascular malformations).

Q: Which of the following is the least common finding in lymphedema?

Ulcer. **Explanation:** Lymphedema is a chronic condition caused by the accumulation of protein-rich interstitial fluid due to impaired lymphatic drainage. Understanding the progression of the disease is key to identifying its clinical features. **1. Why "Ulcer" is the correct answer:** Unlike chronic venous insufficiency (CVI), where venous hypertension leads to stasis and subsequent **venous ulcers** (typically above the medial malleolus), **ulceration is extremely rare in lymphedema.** The skin in lymphedema becomes thickened and fibrotic (hyperkeratosis), which actually provides a tough barrier. Ulcers only occur in lymphedema if there is secondary malignancy (Lymphangiosarcoma/Stewart-Treves Syndrome) or severe neglected infection. **2. Analysis of Incorrect Options:** * **Swelling (D):** This is the hallmark and earliest finding. It typically starts distally (dorsum of the foot) and progresses proximally. * **Pitting (B):** In the **early stages (Stage I)**, lymphedema is pitting. As the disease progresses to Stage II and III, protein accumulation triggers fibroblast proliferation, leading to non-pitting edema due to fibrosis. Since it occurs in the early phase, it is a common finding. * **Chronic Eczema (C):** Long-standing stasis of lymph causes chronic skin changes, including dermatitis, eczema, and "peau d'orange" appearance due to cutaneous fibrosis. **Clinical Pearls for NEET-PG:** * **Stemmer’s Sign:** Inability to pinch a fold of skin on the base of the second toe. It is a **pathognomonic** sign of lymphedema. * **Squaring of Toes:** A characteristic finding in lymphedema due to increased pressure. * **Primary vs. Secondary:** Globally, **Filariasis** (Wuchereria bancrofti) is the most common cause of secondary lymphedema. In developed nations, it is post-mastectomy axillary lymph node dissection. * **Milroy’s Disease:** Congenital lymphedema present at birth (VEGFR3 mutation).

Q: What is the preferred type of graft for an infrainguinal bypass surgery?

Autologous vein. **Explanation:** In infrainguinal bypass surgery (such as femoro-popliteal or femoro-distal bypass), the choice of conduit is critical for long-term success. **Why Autologous Vein is the Correct Answer:** The **Great Saphenous Vein (GSV)** is the "gold standard" conduit for infrainguinal bypass. Autologous veins are superior because they possess a viable endothelial lining that produces nitric oxide and prostacyclin, providing natural **thromboresistance**. They also exhibit better compliance (elasticity) matching the native artery and have significantly higher **long-term patency rates** (especially for targets below the knee) compared to synthetic materials. **Analysis of Incorrect Options:** * **A, B, & C (Dacron, PTFE, Polyester):** These are synthetic prosthetic grafts. While acceptable for large-diameter, high-flow vessels like the aorta (suprainguinal), they perform poorly in the infrainguinal position. * **PTFE (Polytetrafluoroethylene)** and **Dacron (Polyester)** are prone to neointimal hyperplasia at the distal anastomosis and have a high risk of early graft thrombosis in low-flow, small-diameter distal vessels. They are generally reserved only when a suitable autologous vein is unavailable. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** The Great Saphenous Vein (GSV) is the preferred graft. * **Patency:** 5-year patency for vein grafts is ~70-80%, whereas synthetic grafts below the knee drop to <40%. * **Technique:** Vein grafts can be used "In-situ" (valves are lysed) or "Reversed" (valves don't need lysis but the graft is tapered). * **Infection:** Autologous veins are much more resistant to infection than prosthetic grafts, making them mandatory in contaminated fields.

Q: Which of the following suture material characteristics is preferred for vascular anastomosis?

Non-absorbable, non-elastic. **Explanation:** In vascular surgery, the primary goal of an anastomosis is to maintain a leak-proof, permanent connection between vessels that can withstand high arterial pressures over a lifetime. **1. Why Non-absorbable and Non-elastic is Correct:** * **Non-absorbable:** Vascular healing does not result in a strong enough biological bond to maintain the integrity of the anastomosis under constant pulsatile pressure. Therefore, the suture must provide **permanent mechanical support**. Materials like **Polypropylene (Prolene)** are the gold standard because they retain their tensile strength indefinitely. * **Non-elastic:** A suture must be non-elastic to prevent the "bellows effect." If a suture stretches (elasticity) under systolic pressure, the anastomosis site would expand and contract, leading to potential gaps, blood leakage, and eventual pseudoaneurysm formation. **2. Why Other Options are Incorrect:** * **Absorbable (C & D):** These materials (e.g., Vicryl, Monocryl) lose tensile strength over weeks or months. If used in major vessels, the anastomosis would fail once the suture degrades, leading to catastrophic hemorrhage or aneurysm. * **Elastic (A & C):** As mentioned, elasticity allows for movement at the suture line, which compromises the water-tight seal required for vascular surgery. **Clinical Pearls for NEET-PG:** * **Suture of Choice:** Monofilament, non-absorbable **Polypropylene (Prolene)** is the most commonly used. * **Handling:** It has a low coefficient of friction, allowing it to glide through tissues easily (atraumatic). * **Suture Technique:** Continuous suturing is standard for adult vessels, but **interrupted sutures** are preferred in pediatric vascular surgery to allow for the vessel's future growth. * **Needle Type:** Taper-point needles are used to minimize the hole size in the vessel wall, preventing needle-hole bleeding.

Question 1

Which of the following is NOT true about thoracic outlet syndrome?

Accepted Answer

The lower trunks of the brachial plexus are commonly affected.

Answer

Adson's test is used for diagnosis.

Answer

It may be caused by a cervical rib.

Answer

Pain, numbness, and paresthesia in the involved extremity occur.

Question 2

What is the most accurate method for measuring portal hypertension?

Accepted Answer

Hepatic venography

Answer

Doppler ultrasound

Answer

CT

Answer

MRI

Question 3

All are true about intermittent claudication except:

Accepted Answer

Pain is positional

Answer

Most common in calf muscle

Answer

Atherosclerosis is an important predisposing factor

Answer

Relieved by rest

Question 4

What is the most common site for a venous ulcer?

Accepted Answer

Lower 1/3 of leg and ankle

Answer

Sole of foot

Answer

Lower 2/3 of leg

Answer

Middle 1/3 of leg

Question 5

Lumbar sympathectomy is indicated for all of the following conditions EXCEPT:

Accepted Answer

Intermittent claudication

Answer

Causalgia

Answer

Rest pain

Answer

Raynaud's disease

Question 6

What is true about mesenteric vein thrombosis?

Accepted Answer

Heparin is administered.

Answer

Peritoneal signs are always present.

Answer

Thrombectomy is always performed.

Answer

All of the above.

Question 7

A middle-aged man presents with a scalp swelling noticed since childhood. The neck swelling has a 'bag of worms' appearance and a bruit is heard over it. What is the most likely diagnosis?

Accepted Answer

Cirsoid aneurysm

Answer

Plexiform neurofibroma

Answer

Toxic nodular goitre

Answer

Varicocele

Question 8

Which of the following is the least common finding in lymphedema?

Accepted Answer

Ulcer

Answer

Pitting

Answer

Chronic eczema

Answer

Swelling

Question 9

What is the preferred type of graft for an infrainguinal bypass surgery?

Accepted Answer

Autologous vein

Answer

Dacron

Answer

PTFE

Answer

Polyester

Question 10

Which of the following suture material characteristics is preferred for vascular anastomosis?

Accepted Answer

Non-absorbable, non-elastic

Answer

Non-absorbable, elastic

Answer

Absorbable, elastic

Answer

Absorbable, non-elastic

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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